River Fog CR 4
When this haunt is triggered, the area over the water begins to form a fog as per the spell stinking cloud but only a 5 ft by 20 ft area. Those inside the cloud must succeed a DC 14 save or succumb to the cloud’s nauseating effects.
The body of the witch trapped at the bottom of the river must be removed and burned.
Book of Beasts: Monsters of the River Nations, copyright 2010 Jon Brazer Enterprises; Author Steven Helt.